NORTH CAROLINA H3 EXAM

PRACTICE QUESTIONS

  The questions below are representative of the information you'll be required to know in order to pass the h3 heating exam in North Carolina.   If you can successfully answer 24 of the questions within 1-1/2 hours, you should have no problem passing the exam.  If you are not so successful we recommend that you order our home study course or call us at 252-943-1028 to enroll in our one-on-one prep class.

Actual questions on the exam will be presented in a multiple choice format similar to the questions below.

 

      

  1. WHICH OF THE FOLLOWING DOES NOT REQUIRE DISPLAY OF A LICENSE NUMBER
    1. CONTRACTS
    2. YELLOW PAGE ADS
    3. VEHICLE SIGNS
    4. PROPOSALS
  2. A CORPORATION CONVICTED OF CONSPIACY OR COLUSION IN BIDDING MAY BE FINED UP TO $________________.
    1. $ 1,000
    2. $10,000
    3. $100,000
    4. $1,000,000
  3. A PARTICULAR PERMIT COSTS $25.00. IF WORK COMMENCES BEFORE SECURING A PERMIT, THE CONTRACTOR MAY BE SUBECT TO A PENALTY OF $________ , PLUS THE COST OF THE PERMIT?
    1. $25.00
    2. $50.00
    3. $75.00
    4. $100.00
  4. IF A CONTRACTOR WORKS ON 15% NET PROFIT, WHAT WILL HIS SALES HAVE TO BE TO MAKE $75,000?
    1. $500,000
    2. $112,500
    3. $862.500
    4. $600,000
  5. A CONTRATORS PAYS $750.00 FOR A FURNACE PLUS 7% SALES TAX.  WHAT WILL HIS SALES PRICE BE IF HE WISHES TO MAKE 30% GROSS PROFIT
    1. $1028
    2. $1043
    3. $ 975
    4. $1146
  6. THE MINIMUM THICKNESS OF REFRIGERATNT LINE INSULATION FOR A RESIDENCE IS
    1. Ό”
    2. 3/8”
    3. ½”
    4. 5/8’
  7. THE DISTANCE FROM A METER TO A NATURAL GAS WATER HEATER (40,000 BTUH) IS 30 FEET, 20 FEET FURTHER DOWN THE LINE IS A FURNACE (120,000BTUH).  WHAT IS THE MINIMUM PIPE SIZE THAT MUST BE USED BETWEEN THE WATER HEATER AND FURNACE? (PRESSURE DROP =.05)
    1. 3/8”
    2. ½”
    3. Ύ”
    4.  1”
  8. A HOUSE HAS A HEAT LOSS OF 48,000 BTUH AT 20 DEGREE OUTDOOR TEMPERATURE.  WHAT IS THE HEAT LOSS AT 40 DEGREE OUTDOOR TEMPERATURE?
    1. 24.000 BTUH
    2. 28,800 BTUH
    3. 19,200 BTUH
    4. 18,000 BTUH
  9. A CEILING HAS A TOTAL U VALUE OF .O7.  WHAT IS THE NEW R VALUE IF R 19 IS ADDED?
    1. 30
    2. 31
    3. 32
    4. 33
  10. A  30’ X  8’ PARTITION (2 X 4 STUDS, GYPSUM ON BOTH SIDES. NO INSULATION) SEPARATES TWO ROOMS HAVING A TEMPERATURE DIFFERENCE OF 20 DEGREES.  WHAT IS THE WINTER HEAT LOSS THROUGH THE PARTITION?
    1. 15,360 BTUH
    2. 3,535 BTUH
    3. 1,500 BTUH
    4. 2,609 BTUH
  11. A 75,000 BTUH (INPUT RATING) 80% EFFICIENT FURNACE HAS A TEMPERATUR RISE OF 45 DEGREES. WHAT IS THE CFM?
    1. 1212
    2. 1667
    3. 1515
    4. 1175
  12. A CUSTOMER MOVES UP FROM A 8 SEER TO A 12 SEER AIR CONDITIONER WHAT WOULD HIS YEARLY SAVINGS BE IF HE WAS PAYING $650 PER YEAR FOR AIR CONDITIONING?
    1. $325
    2. $260
    3. $197
    4. $217
  13. A HEAT PUMP IN A RESIDENCE MUST BE CONTROLLED BY WHICH OF THE FOLLOWING
    1. PROGRAMABLE THERMOSTAT
    2. HANDLE THE LOA DEVICE TO PREVENT ELECTRIC SUPPLEMENTARY HEAT FROM COMING ON IF HEAT PUMP CAN AD ALONE
    3. A DEVICE THAT ALLOWS SUPPLEMENTARY HEAT OPERATION DURING DEFROST CYCLES EXCEEEDING 15 MINUTES
    4. A FOSSIL FUEL KIT
  14. IN A ROOM THAT IS LARGE IN COMPARISION WITH THE SIZE OF EQUIPMENT, AN APPLIANCE THAT REQUIRES 18” CLEARANCE ON ITS SIDES MAY HAVE IT’S CLEARANCE REDUCED TO ______ “ IF .024 SHEETMETAL WITH A VENTILATED AIR SPACE IS USED TO PROTECT THE COMBUSTIBLE SURFACE.
    1. 12”
    2. MAY NOT HAVE CLEARANCE REDUCED
  15. WHAT IS THE VELOCITY OF AIR 1400 CFM AIR IN A DUCT MEASURING 12” X 30”
    1. 360 FPM
    2. 467 FPM
    3. 3.8 FPM
    4. 560 FPM
  16. CATEGORY I EQUIPMENT MAY BE VENTED WITH WHICH OF THE FOLLOWING TYPE VENTS
    1. SINGLE WALL METAL
    2. TYPE B
    3. CHIMNEY WITH CLAY LINER
    4. ALL THE ABOVE
  17. TWO NATURALLY VENTILATING APPLIANCES WITH A COMBINED CAPACITY OF 128,000 BTUH ARE CONNECTED TO A COMMON B-VENT 18’ HIGH WITH TWO 90 DEGREE ELBOWS.  WHAT SIZE COMMON VENT SHOULD BE USED?

 

     18.    A LICENSEE MAY HAVE HIS LICENCE REVOKED FOR WHICH OF THE FOLLOWING

    1. MISCONDUCT
    2. GROSS NEGLIGENCE
    3. INCOMPETENCE
    4. ANY OF THE ABOVE

 

  1. THE MAXIMUM ALLOWABLE HOIZONTAL LENGTH OF A CATEGORY I APPLIANCE VENT CONNECTOR IS __________ FEET FOR EACH INCH OF IT’S DIAMETER.
    1. ½
    2. 1
    3. 1.5
    4. 2

 

  1. THE MAXIMUM HORIZONTAL LENGTH OF A SINGLE WALL METAL CONNECTOR IS ­­­­___________ % OF THE HIEGHT OF THE CHIMNEY OR VENT.
    1. 50
    2. 75
    3. 100
    4. 150
  2. IN ORDER TO SUPPLY OUTDOOR COMBUSTION AIR USING THE TWO OPENING METHOD WITH HORIZONTAL DUCTS, WHAT SIZE WOULD EACH DUCT BE TO HANDLE A 140,000 BTUH FURNACE?
    1. 7” X 10”
    2. 3.5” X 10”
    3. 14” X 10”
    4. 8.5” X 10”
  3. IF A GALLON OF OIL CONTAINING 140,000 BTUS SELLS FOR $1.25, HOW MUCH WILL 1,000,000 BTUS COST WHEN USED IN AN 80% AFUE OIL FURNACE?
    1. $8.93
    2. $14.00
    3. $12.78
    4. $11.16
  4. IN WHICH OF THE FOLLOWING AREAS MAY A SINGLE WALL MOUNTED 4,000 BTUH UNVENTED GAS HEATER EQUIPED WITH AN OXYGEN DEPLETION SENSOR BE ALLOWED?
    1. SLEEPING ROOMS
    2. BATHROOM
    3. STORAGE CLOSET
    4. SURGICAL ROOM
  5. GAS APPLIANCE CONNECTORS SHALL NOT PASS THROUGH ANY OF THE FOLLOWING EXCEPT:
    1. WALLS
    2. APPLIANCE HOUSINGS
    3. FACTORY BUILT FIREPLACE INSERTS
    4. FLOORS
  6. USED REFRIGERANTS SHALL NOT BE REUSED IN A DIFFERENT OWNER’S EQUIPMENT UNLESS TESTED AND FOUND TO MEET THE PUITY REQUIREMENTS OF;
    1. ASHRAE 34
    2. NFPA 54
    3. ASTM A53
    4. ARI 700
  7. AN AIR CONDITIONER HAS HIGH SUCTION AND LOW HEAD PRESSURES.  WHAT WOULD BE A LIKELY CAUSE?
    1. DIRTY FILTERS
    2. BAD OR WEAK COMPRESSOR VALVES
    3. CLOGGED METERING DEVICE
    4. DIRTY CONDENSER COIL

 

 

 

  1. A HOUSE HAS A HEATING LOAD OF 46,800 BTUH.  HOW MANY CFM ARE REQUIRED IN A ROOM WITH A LOAD OF 5200 BTUH, USING A FURNACE WITH A 1200 CFM BLOWER.
    1. 1112
    2. 112
    3. 133
    4. 468
  2. WHAT IS THE DESIGN FRICTION RATE WHEN THE AVAILABLE STATIC PRESSURE FOR THE DUCT SYSTEM IS .36 AND THE RUN WITH THE LONGEST EFFECTIVE LENGTH IS 375 FT.
    1. .10
    2. .08
    3. .05
    4. .15
  3. A BLOWER WITH AN EXTERNAL STATIC PRESSURE OF .55” WC IS CONNECTED TO A 70 FT.  LONG DUCT.  THE SYSTEM INCLUDES REGISTERS AND GRILLS (.03 “ WC EACH), A COOLING COIL (.15” WC), AND FILTER (.10” WC).  WHAT IS THE TOTAL AVAILABLE STATIC PRESSURE FOR SIZING THE DUCT?
    1. .24
    2. .17
    3. .30
    4. .15
  4. A 12” ROUND DUCT HAS A RECTANGULALOR EQUIVALENT OF
    1. 14 X 8
    2. 15 X 8
    3. 16 X 8
    4. 17 X 8
  5. THE VELOCITY OF 250 CFM OF AIR IN A FLEXIBLE, SPIRAL WIRE HELIX CORE DUCT SIZED AT .08” WC STATIC PRESSURE IS.
    1. 400 FPM
    2. 500 FPM
    3. 750 FPM
    4. 90O FPM
  6. THE ONLY THING THAT CHANGES WHEN CONVERTING FROM A ROUND DUCT TO AN EQUIVALENT RECTANGLE DUCT IS.
    1. VELOCITY
    2. STATIC PRESSURE
    3. AREA
    4. CFM
  7. FOR A BUILDING TO BE MAINTAINED AT 70F HOW MANY BTUH ARE REQUIRED TO OFFSET 300 CFM OF 20F OUTDOOR VENTILATION?

A.       6,000

B.       1,400

C.       6,600

D.       16,500

        34.   THE AMERICANS WITH DISABILITIES ACT APPLIES TO ALL EMPLOYERS WHO HAVE ______ OR    M

                MORE EMPLOYEES?

    1. 10
    2. 15
    3. 25
    4. 50

 

 

THESE QUESTIONS WHERE PREPARED BY ENERGY MARKETING SERVICES IN ORDER TO GIVE EXAMPLES OF THE TYPE QUESTIONS THAT ARE FOUND ON THE H3 LICENSING EXAM.  THEY ARE ONLY REPRESENTATIONS OF QUESTIONS FOUND ON THE EXAM, NOT ACTUAL QUESTIONS.

 

FOR INFORMATION ON ATTENDING OUR H3 EXAM PREP COURSE CONTACT

ENERGY MARKETING SERVICES

252-943-1028

 

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